Disclosed is a tablet comprising a sodium chloride powder and an abundance of nanosilicon particles having a particle size in the range of 1.5 to 2.0 nm, 2.0 to 2.5 nm or 2.5 to 3.5 nm blended into the powder, which can emit a fluorescent light with blue, green or red color in the blood upon being irradiated with ultraviolet ray or visible light. The tablet can be produced by immersing nanosilicon particles in a mixed solution containing a therapeutic agent and a polymeric compound such as a polysaccharide or protein, subjecting the resulting mixture to a thermal treatment and then mixing the resulting product with a sodium chloride powder.
